Pneumatic pad for printing-presses.



'0. A. STURTEVANTK.

FNEUMATIC PA-D FOR PRINTING PRESSES.

WITNESSES APPLICATION FILEVD ,IUNE I3, 1913.

y Patented July 6, 1915.

an srarns rai-afar carica.

CHARLES A. srunrnvannor PLAINFrELD, vnew'.nlasnfsr. r

` lifiviizuivniirro ran Foa PRINTING-PRESSES.

To all wL'Qmz't-maycoacem l Be it known that I, CHARLES A; STURTE- VANT,a citizen of the United States,and a resident of Plainfield, in Vthe county 0f l. Union and State of New Jersey, have 1nvented certain new and useful'l Improvements in Pneumatic Iadsf'for Printing- Presses, of which the. following is a specilication taken in connection with the accompanying drawing, which forms a part of the same.

My 'invention relatesl to l Apneumatic:` pads for printingfpresses.` Y

It relates more particularly :tolpneumatic pads to beused with the wipingy or polishing mechanism of printing presses and to insure the wiping or polishing material, as for eX-` ample `fabric,"being pressedall points with equal pressure against-'the plate or roll to insure the polishing or' wiping material thoroughly and evenlywiping or' polishing thev plate, roll or othermember which is to be wiped or polished.

In `the accompanying drawing` showingf illustrative embodiments of my invention and in which the same reference numerals refer to similar parts inthe several figures, Figure 1 is a longitudinal vertical section through one form of my improved pneumatic pad; Fig. 2 is ajdetail'fragmentary vertical section on an Venlarged scale; Fig.

r3 is a detail vertical section onv an enlarged scale and substantially the same View as that'shown in Fig.` 2, with the exception that the padlis deflated; Fig. '4 is a longitudinal vertical section' through a modified form of pad substantially" onthe line V4 4 ofF ig. 6 loolringin the direction of the arrows; Fig. 5. isa'transverse vertical'section substantially on the` line 5 5 :of Fig. 4'

looking in the directionlofthe arrows-and showing in" 'addition one formof platen upon which the pad is usually mounted and also a wiping or. polishingv fabric; Fig. 6 is .a horizontal section substantially on the' line 6-6 of Fig. 5 .looking in the direction of the arrows; Fig. 7 is'a transverse vertical sectionof a modified form; and Fig. 8 isa sectional View, ,ona reduced scale, of another form of my pneumatic pad. 1

In the illustrative embodiments of my iinvention 'shown'in the drawings, l is a pneumatic `pad lpreferably formed` dish shaped having an operating face 2 formed of a front member 3, a 'back'member 4,v with an Specification of Letters Patent.

strip 11 of rubber with a reinforcingstrip l12 of fabric orsuitable materiah-which re `of the upturned flanges 6, 6.

interposed closed air tight Vchainber.` I l` ing machine, Fig.- 5. :'Ifhe pad'isseoured i directly to theV platenby anysuitable means such as bv the screws 9`passing through the" l v k flanges 6, A6, theclamping-pl'ates'10,' 10v being also preferablyused. v f

I. preferably formmy'lpneumatic pad'of rubber and reinforcingfmaterial, ordinarily some suitable form of. 1fabric,f though, of y course, my invention is not tojbelimitedto' fabric, for 4any suitable form ofreinforcing 1 material comes under f the vention.y

havey shown the back portion-4 `formed ofa inforcing strip extends completelyover-the rubber strip 11 and preferably up the sides i y The lower or .face memberB is preferably 'formed ofa thicker strip ofrubber '13 which for nearly its entire surface is reinforced Yby any suitable reinforcingfmaterial as fabric x14; this fabric 14 extends nearly tothe side 15,@15 but stops substantially` at thef'pointf 16,.16so as vto leave a' strip 17 of unrein- "forced'rubben' v i. y .Y

Theclosed air chamber isprovided with f any suitable valve 18, Fig. 2, to coperate with a pneumatic pump .or -any suitable sourcek of fluid supply to'inflate the pad 1. In its non-iniiated condition the pad issub- 'stantially as shown in Fig. 3. ,Wheny inflated, however, through :the valve18,lair or :other Huid is forced into -the vchamber-.5e

which will cause the frontmember 3 to be forced awayfrom the backmember. 4. To

'prevent' bellying or unequal expansion-of portions of the front face I providethat f yface with the reinforcing strip 14 "whichtis 1,00f

stopped short lof the sides-15,15. By :this construction the member 3 will.` expand when inflated substantially'parallel tothe back' 4, the entire face member '3remaining` 'substantiallyw'flat for the yieldingjjof the 105,

member will be confinedv to the un-reinforcedends 17 17, the rubber at that point i yielding or stretching a's'shown in' Fig. 2.

This will 'insure whatever vmaterial `mayv'be .-j beneath the surface 3 being presented against 110 y Patented July e, 19151.. Application ledJ une 13, 1913. Serial No. 773,417. i I i i terms ofmyin-'r e' For `purposes of illustration-I the plate to be operated onwith substantially equal pressure throughout its entire surface. If used with a polishing or wiping mechanism, my pad will insure that all portions of the wiping or polishing material, such as for example the fabric 23,l Fig. 5, being pressed with equal pressure against the plate to be wiped or polished, for the front member 3 will not bulge or bow under the pressure of the infiating air, but on the contrary will expand evenly and in its expanded position will be substantially parallel to the back member 4 and the platen S to which it is usually connected. In some cases is I may further insure the surface 3 being always parallel to the surface 4 by using tying members between the two members 3 and 4, extending through the pneumatic chamber 5.v Various forms of such tying or reinforcing members may be used. In Figs.

4, 5 and 6 I have shown longitudinally extending ribs 19, 19 which are preferably of rubber and formed integral with the pad and connect the members 3 and 4 of the operating face. These tying or strengthening ribs 19, 19 do not extend to the ends of the pneumatic pad so that they do not divide the chamber 5 into a plurality of chambers, this chamber 5 in all forms of my invention being simply a single chamber which can be inflated through one valve. Nor do they interfere with the give or elasticity of the un-reinforced rubber portions 17, 17.

Instead of using ribs I may in some cases l use one or more connecting teats 20, 20, Fig. 7, connecting the members y3 and 4 together. In all of these cases whether the reinforcing ribs or teats 19 and 20, respectively, are used or not, the expansionor yielding of the pad will take place at the weakened or nonreinforcing portions 17, 17. rlhe ribs 19, and teats 20, when used, simply further in sure that the yielding will be confined to these weakened or non-reinforcing portions 17 of the pad, and in all cases a substantially fiat operating face 3, and one which is substantially parallel to the member 4 will be presented to the part or member with which the pad is to coperate in a printing machine.

My invention is equally adapted to be used with rotary printing presses.

I have shown on a small scale in Fig. 8 my pad 25 formed with a concave surface 26 5.5 to coperate with the surface of the roll 27 illustrated diagrammatically in dotted lines. Between my pneumatic pad and the surface of the roller 27 a polishing or wiping material 23 is preferably used. This type of 30 pad is the same as the others except that it is so shaped as to coperate with a roll instead of a plate. It is preferably formed of rubber having a reinforcing strip of fabric 28 extending up the flanges 29, 29 and is also provided with a reinforcing strip 30 similar to the strip 14 in the other forms and with weakened unreinforced portions 31, 31, the front and back portions of the pad being connectedby members 32, 32 to insure that the pad will expand evenly as in the other forms.

Having thus described this invention in connection with the illustrative embodiments thereof to the details of which I do not desire to be limited, what is claimed as new and what it is desired to secure by Letters Patent is set forth in the appended claims.

1. A pneumatic pad for printing presses comprising a closed pneumatic chamber provided with, an upper surface of rubber reinforced throughout its length, av lower surface of rubber reinforced except substantially at the meeting edges of the sides and front face, and unreinforced rubber on the sides of the pneumatic chamber.

2. A pneumatic pad for printing presses comprising a closed pneumatic chamber formed of yielding and non-yielding material, the two materials extending entirely around the pneumatic chamber except at the ends where the unyielding material is omitted.

3. Apneumatic pad for printing presses comprising a closed pneumatic chamber formed of yielding and non-yielding material, the two materials extending entirely around the pneumatic chamber except at the ends where the unyielding material is omitted, and connecting means extending through the pneumatic chamber and secur- 10o ing the front and back of the pad together.

4. A pneumatic pad for printing presses comprising a closed pneumatic chamber formed of yielding and non-yielding material, the two materials extending entirely around the pneumatic chamber except at the ends where the unyielding material is omitted, and integral connecting or reinforcing members extending through the neumatic chamber and securing the front and back of the pad together.

5. A pneumatic pad for printing presses comprising a dish shaped member having integral upturned iianges to be directly secured to a platen or similar member provided with a hollow operating face formed of front and back members with an interposed air tight chamber between them, and means upon the inflation of the pad to insure that the front face member will expand substantially parallel to the back member of the operating face.

6. A pneumatic pad for printing presses comprising a dish shaped member having integral upturned flanges to be directly secured to a platen or similar member and provided with a hollow operating face formed of front and back members with an interposed air tight chamber -between them and connecting members between the front and back face members to insure the front` face member expanding substantially parallel to the back member.

7 A pneumatic pad for printing presses formed of rubber and reinforcing fabric including an operating face formed of side and separated reinforced front and back portions, together forming a closed pneumatic chamber, the reinforcement in the back member extending throughout that member, theV reinforcement in the front member extending throughout that member except substantially atits meeting edges with the side members at Which points the rubber is not reinforced.

A8. A pneumatic pad for printing presses formed of rubber and reinforcing fabric including an operating face formed of side and separated reinforced front and back portions, together forming a closed pneumatic chamber, the reinforcement in the back member extending throughout that member, the reinforcement in the front member extending throughout that member except substantially at its meeting edges With the side members at Which points the rubber is not reinforced, and connecting members between the front and back portions extending through the pneumatic chamber.

9. A pneumatic pad for printing presses formed of rubber and reinforcing fabric including an operating vface formed of side o and separated reinforced `front and back portions, togetherr forming a 4closed pneumember, the reinforcement in the front `member extending throughout that member except substantially at its meeting edges kWith the side members at which points the rubber is not reinforced, and integral upturned iangesto secure the pneumatic pad to a platen or similar surface.

v 10. `A pneumatic pad 'for printing presses formed of rubber and reinforcing fabric including an operatingface formed of side and separated reinforced front and back portions, together forming a closed pneumatic chamber, the reinforcement in the back member extending throughout that member, the reinforcement in the front member extending throughout thatmember except substantially at' its meeting" edges with the side members at Which `points the rubber is not reinforced, and connecting members between the front and back portions extending through the pneumatic` v chamber.

CHARLES A. STURTEVANT.

Copies of this patent may be obtained for ve cents each, by addressing the Commissioner of Patents,

' Washington, D. C.y 

